Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A line on a weather map connecting points of equal atmospheric pressure. Also called isopiestic.
  • n. Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A line drawn on a map or chart connecting places of equal or constant pressure.
  • n. Either of two nuclides of different elements having the same mass number.
  • n. A set of points or conditions at constant pressure.

from the GNU version of the Collaborative International Dictionary of English

  • n. A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line.

from The Century Dictionary and Cyclopedia

  • n. In physical geography, a line connecting places on the surface of the globe at which the barometric pressure is the same.
  • n. In thermodynamics, a line or curve determined by the equation of state (pv = RT) of a system when p has any constant value; a line of equal pressures.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (meteorology)an isogram connecting points having equal barometric pressure at a given time

Etymologies

iso- + Greek baros, weight; see gwerə-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἴσος (isos, "equal") + βάρος (baros, "weight") (Wiktionary)

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